Research on dynamic mechanical properties of metal rubber under high speed impact

DOI:	10.11809/bqzbgcxb2024.03.034
Keywords:	metal rubber; structural parameters; dynamic mechanical properties; energy absorption characteristics; split Hopkinson Pressure Bar
Abstract:	To investigate the dynamic mechanical properties of metal rubber under high speed impact conditions, solid cylindrical metal rubber specimens were prepared, and dynamic compression tests were conducted using a Split Hopkinson Pressure Bar (SHPB). The dynamic stress strain behavior of the metal rubber was analyzed, and the influence of strain rate and spring coil outer diameter on the dynamic elastic modulus, dynamic peak stress, energy absorption, and ideal energy absorption efficiency of the material was investigated. The results reveal that the dynamic stress strain curve can be divided into three stages: elastic deformation, local plastic deformation, and failure. Both dynamic elastic modulus and dynamic peak stress exhibit characteristic strain rate effects, decreasing with an increase in the outer diameter of the spring coil. Furthermore, with increasing strain, the energy absorption performance gradually improves with higher strain rates and smaller outer diameters of the spring coil. The ideal energy absorption efficiency is minimally affected by the strain rate, but it gradually increases with strain and tends to plateau, with saturation values exceeding 0.75. When the spring coil outer diameter is 3mm, the metal rubber demonstrates optimal ideal energy absorption efficiency, with a saturation value of 0.88. This indicates that the metal rubber material exhibits excellent energy absorption and impact resistance under high speed impact conditions.
Issue:	Vol. 45 No. 3 (2024)
Published:	2024-03-28
PDF HTML